Things you need to know about JVM (that matter in Scala)

Understand the JVM From a Scala Perspective

Scala programmers often focus on language features, but the JVM underneath shapes everything from performance to type behavior. This practical guide by Mateusz Kubuszok fills the gap between knowing Scala syntax and truly understanding the platform your code runs on.

What This Book Covers

The book is organized around the JVM topics that most directly affect Scala development, avoiding exhaustive Java certification material in favor of focused, actionable knowledge.

Core JVM Concepts for Scala Developers

• Primitives, references, and boxing
• Classes, objects, and type erasure
• Threads, concurrency, and synchronization
• Garbage collection and memory management
• Reflection and its pitfalls
• JIT optimizations and performance tuning

Why This Book Is Different

Instead of a generic JVM overview, each chapter connects JVM internals directly to Scala programming. You’ll see why immutability comes with costs, how type erasure influences generic code, and how the JVM’s execution model affects functional programming patterns.

Who Should Read It

Scala developers who have basic language experience but want a deeper understanding of runtime behavior will get the most value. Java developers transitioning to Scala will also appreciate the clear explanations of JVM fundamentals from a Scala-centric perspective.

If you’ve ever been puzzled by a Scala performance issue, a confusing type error, or unexpected concurrent behavior, this book gives you the mental models and vocabulary to reason about the JVM with confidence.